Clackamas' Aaron Ahlstrom battles with Forest Grove's Luis Salgado Garcia for a ball during the quarterfinals of the OSAA Class 6A quarterfinals Saturday in Clackamas. (Tyson Alger, The Oregonian)

CLACKAMAS — The Clackamas Cavaliers used three first-half goals to breeze by the Forest Grove Vikings Saturday to advance to the OSAA Class 6A semifinals.

The Cavaliers, who won 5-1, put the pedal to the floor from the first whistle. After several close attempts, the Cavaliers finally broke through when Ian Tarnovsky's chip-shot sailed above Forest Grove keeper Reggie Lopez-Orasco's head with 15:09 left in the first half.

Just over a minute later Adan Carzes-Trejo slipped through the defense to give the Cavaliers a 2-0 lead.

Clackamas head coach Anthony Trejo said the Cavaliers always play with intensity from the star and it was only a matter of time before a ball went in the net.

"All year we've had a lot of missed chances to start the game," Trejo said. "All I care about it creating the opportunities because eventually they go in."

The Vikings brought the game to within a goal with 7:27 remaining in the first-half when Luis Salgado Garcia banged in a Lopez-Orasco rebound, but the Cavaliers countered with a second Tarnovsky goal and added two more in the second half to clinch the win.

"I've said that there are some better teams that can beat my team, but they have to play really well," Forest Grove head coach Angelo Simonetti said. "Today was one of those days."

The Cavaliers will face the winner of the Lincoln/McMinville game in the semifinals on Tuesday.